<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
.spinner {
  margin-top: 100px;
    margin-right: auto;
    margin-bottom: 100px;
    margin-left: auto;
  width: 50px;
  height: 50px;
  position: relative;
}
 
.container1 > div, .container2 > div, .container3 > div {
  width: 12px;
  height: 12px;
  background-color: #FF0000;
 
  border-radius: 100%;
  position: absolute;
  -webkit-animation: bouncedelay 1.2s infinite ease-in-out;
  animation: bouncedelay 1.2s infinite ease-in-out;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}
 
.spinner .spinner-container {
  position: absolute;
  width: 100%;
  height: 100%;
}
 
.container2 {
  -webkit-transform: rotateZ(45deg);
  transform: rotateZ(45deg);
}
 
.container3 {
  -webkit-transform: rotateZ(90deg);
  transform: rotateZ(90deg);
}
 
.circle1 { top: 0; left: 0; }
.circle2 { top: 0; right: 0; }
.circle3 { right: 0; bottom: 0; }
.circle4 { left: 0; bottom: 0; }
 
.container2 .circle1 {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
 
.container3 .circle1 {
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}
 
.container1 .circle2 {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
 
.container2 .circle2 {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
 
.container3 .circle2 {
  -webkit-animation-delay: -0.7s;
  animation-delay: -0.7s;
}
 
.container1 .circle3 {
  -webkit-animation-delay: -0.6s;
  animation-delay: -0.6s;
}
 
.container2 .circle3 {
  -webkit-animation-delay: -0.5s;
  animation-delay: -0.5s;
}
 
.container3 .circle3 {
  -webkit-animation-delay: -0.4s;
  animation-delay: -0.4s;
}
 
.container1 .circle4 {
  -webkit-animation-delay: -0.3s;
  animation-delay: -0.3s;
}
 
.container2 .circle4 {
  -webkit-animation-delay: -0.2s;
  animation-delay: -0.2s;
}
 
.container3 .circle4 {
  -webkit-animation-delay: -0.1s;
  animation-delay: -0.1s;
}
 
@-webkit-keyframes bouncedelay {
  0%, 80%, 100% { -webkit-transform: scale(0.0) }
  40% { -webkit-transform: scale(1.0) }
}
 
@keyframes bouncedelay {
  0%, 80%, 100% {
    transform: scale(0.0);
    -webkit-transform: scale(0.0);
  } 40% {
    transform: scale(1.0);
    -webkit-transform: scale(1.0);
  }
}

		</style>
	</head>
	<body>
		 <div class="um-win" id="index">
		    <div class="um-header">
		        <h3>导航栏</h3>
		    </div>
		
		    <div class="um-content">
		        <div class="spinner">
		            <div class="spinner-container container1">
		                <div class="circle1"></div>
		                <div class="circle2"></div>
		                <div class="circle3"></div>
		                <div class="circle4"></div>
		            </div>
		            <div class="spinner-container container2">
		                <div class="circle1"></div>
		                <div class="circle2"></div>
		                <div class="circle3"></div>
		                <div class="circle4"></div>
		            </div>
		            <div class="spinner-container container3">
		                <div class="circle1"></div>
		                <div class="circle2"></div>
		                <div class="circle3"></div>
		                <div class="circle4"></div>
		            </div>
		        </div>
		    </div>

	</body>
</html>
